Clasp for securing optical lens

Details Clasp for securing optical lens Clasp for securing optical lens

F - Mech Eng,Light,Heat,Weapons

16

B

F16B 35/04 (2006.01) G02C 9/04 (2006.01)

Patent

CA 2266808

The clip-on sunglasses assembly includes four clasps for engaging the frame of eyeglasses. Each includes a screw which secures the sunglass lens within a recess in the clasp. The end of the screw is provided with a central recess defining a circular edge. As the screw is tightened, the edge contacts the lens and forms a circular groove in the lens surface by displacing a small amount of lens material. The circular contact area distributes the stress normally concentrated at a point on the lens by a conventional screw, thereby reducing the chances of cracking the lens. Two clasps are welded to the ends of a bridge member and affixed to pre-shaped lenses at marked locations. Each clasp has a bent tail bar enclosed by a heat shrinkable tube.

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